Shaver



F. P. MUSSO June 12, 195] SHAVER Filed April 16, 1949 -'atentecl June12, 195 1 UNITED star;

gm OFFICE" 2 Claims.

This invention relates to a motorized shaver and has for its principalobject the provision of a simple and inexpensive mechanical shaver whichis cap-able of producing a fast, clean shave.

Further and other objects of this invention will become apparent as thedisclosure proceeds and the description is read in conjunction with theaccompanying drawings, in which Fig. 1 is a perspective view showing apreferred form of my invention;

Fig. 2 is a vertical cross-sectional View through the shaver head with afragmentary portion shown in elevation; and

Fig. 3 is a plan view of the shaver blade.

It is well-known that when using a conventional safety razor of the typein which a thin razor blade is held within a guard holder and moved overthe face, a smoother and easier shave is obtained when the blade ismoved at a slight angle across the face rather than directly down acrossthe face. This is because the edge of a razor blade, even though keenlysharpened, nevertheless has microscopic serrations along the cuttingedge so that when the blade is moved with a sidewise Component, theblade actually acts as a saw in cutting the individual beard hairs.

The same principle is applied, but to a much greater extent, in themotorized shaver of my invention which comprises a suitably housed motorm having a rotatable shaft I l which supports a rotating blade holder,generally designated l2. The blade holder comprises an invertedconeshaped head !3, preferably of light gauge metal, which telescopesover the shaft i l and is piimed or otherwise Secured thereto as shownat I 4. The head l 3 is preferably formed with a threaded portion l5which joins with an inwardly tapering platform 16.

Resting upon the platform IE is a guard, enerally designated IT,preferably molded of plastic material and having a rim portion l8 whichconforms to the inwardly tapering platform IB, and from which rises asmoothly curved facial guard !9. The guard member is preferably cut outas shown at to conserve on weight. i

The cutting blade 2! is made of high-grade, tempered steel, and is offrusto-conical form with its lower margin resting upon the rim s of theguard member l'l. The blade 2! has a fine cutting edge 22 which isspaced apart a suitable distance from the rounded guard IS for reasonshereinafter explained. The blade is held in place on the holder 12 by aplastic cap 23 having a threaded portion 24 which mates with thethreaded portion !5 of the head l3. The upper 2 margin of the cap isformed to match the angle of the blade 2 I, so that as 'the cap isscrewed home, the blade 2l and guard 19 are firmly secured on the head!3.

In use, the shaver is held more or less perpendicular to the face and ismoved in a circulatory path over the face. The angle of the blade 2l andthe shape and the spacing of the guard !9 are such that the action ofthe shaver in moving across the face is the same as in a conventionalsafety razor, with the exception that the rotating blade 21 continuallyserves to move across each heard hair in saw-like fashion to aid insevering the hair, and in addition, the shaver is in a position toperform its intended function no matter in which direction the shaver ismoved across the face( This results in a clean, fast shave and isparticularly useful with boards characterized by the hair lying withvarious orientation across the face.

The razor of this invention may be used either as a dry shaver or withthe usual face preparation for wet shaving. The shaver may be easilycleaned by removing the cap 23, the blade 2 l, and the guard Il.

The speed of the motor may be selected according to design, but anordinary motor speed of 1800 R. P. M. is satisfactory.

The blade 2 I, which is characterized by its internal cutting edge 22,may be replaced when dulled, or may be readily sharpened by rotating itagainst a suitable honing stone properly shaped to 'provide the desiredcutting edge.

The invention may be variously embodied and modified, as for example,the blade holder l2 may be rotated about an axis slightly eccentric tothe axis of the shaft ll so that the head will have, in addition to arotary movement, a slight translatory movement. Also the internalcutting edge 22 need not be circular; it may be scalloped, or otherwiseshaped, although in such forms sharpening of the cutting edge becomes aproblem. Also it is possible to provide a stationary cylindrical guard,such as shown at 25, frictionally held on the casing ill and telescopedover the revolving head !2 to aiiord better protection to the user.

It should be noted that the action of my cutting blade differentiatesfrom the many types of mechanized shavers which employ a shearingprinciple (i. e. grasping each hair between relatively moving shearingblades).

I claim:

1. A mot'orized shaver comprising a motor, a shaft rotated by saidmotor, a blade holder mounted on the shaft for rotary movement with 3the shaft, a frusto-conical blade mounted on the holder and having a,circular internal cutting edge, and a guard projecting upwardly throughthe opening in the cutting blade which defines the internal cuttingedge.

2. In a motorized shaver, the combination of a motor housing, a motor inthe housing, a shaft rotated by the motor, a threaded head Secured tothe shaft and having an external threaded portion, and an inwardlytapered platform along its upper margin, a guard member adapted to restupon said blade, a cutting platform of frustoconical shape alsosupported on said platform, said cutting blade having its upper marginsharpened to provide a circular internal cutting edge, 15 2,369,821

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,973,631 Johnson Sept. 11, 19342,081,366 Muros May 25, 1937 Eclov Feb. 20, 1945

